Examinando por Autor "Rubio-Paramio, Miguel Ángel"

Mostrando 1 - 16 de 16

A new hybrid method for demoldability analysis of discrete geometries
(Elsevier, 2016-07-27) Mercado-Colmenero, Jorge Manuel; Rubio-Paramio, Miguel Ángel; Pérez-García, Jesús María
In this paper, a new method for demoldability automatic analysis of parts to be manufactured in plastic injection is presented. The algorithm analysis is based on the geometry of the plastic part, which is discretized by a triangular mesh, posing a hybrid discrete demoldability analysis of both the mesh nodes and facets. A first preprocessing phase classifies mesh nodes according to their vertical dimension, assigning each node a plane perpendicular to the given parting direction. By selective projection of facets, closed contours which serve as the basis for calculating the demoldability of the nodes are created. The facets are then cataloged according to demoldability nodes that comprise demoldable, non-demoldable and semi-demoldable facets. Those facets listed as semi- demoldable are fragmented into demoldable and non-demoldable polygonal regions, causing a redefinition of the original mesh as a new virtual geometry. Finally, non-demoldable areas are studied by redirecting the mesh in the direction of the sliding side, and again applying the processing algorithm and cataloging nodes and facets. Resoluble areas of the piece through mobile devices in the mold are obtained. The hybrid analysis model (nodes and facets) takes advantage of working with a discrete model of the plastic part (nodes), supplemented by creating a new virtual geometry (new nodes and facets) that complements the original mesh, providing the designer not only with information about the geometry of the plastic piece but also information on their manufacture, exactly like a CAE tool. The geometry of the part is stored in arrays with information about their manufacture for use in downstream applications.
A New Method for Quantifying the Asymmetry of Biological Elements by Means of a Photogrammetric Technique Using a Parametric Computer-Aided Design System
(MDPI, 2022-11-02) Montalvo-Gil, Juan Manuel; Azorit, Concepción; Valderrama-Zafra, José Manuel; Rubio-Paramio, Miguel Ángel
In the area of zoology, it is of great interest to determine the degree of asymmetry existing in the different animal structures in order to establish it as a variable (biomarker). In this study, a new methodology is proposed for obtaining this variable ‘Asymmetry Index.’ Forty-eight Ibe-rian red deer antlers (Cervus elaphus hispanicus) from hunting reserves in the province of Jaen (Spain) have been used. The degree of asymmetry of their antlers between homologous points considered in the two right and left sides of each antler was obtained. The methodology is ap-plied within a parametric Computer-Aided Design system from the photogrammetric restitu-tion of the antler from two photographs. The procedure compares the degree of asymmetry in which the points of each of the right and left sides of the antler are found by means of lengths and angles with respect to an established reference plane based on the geometry of the speci-men’s skull. As a result of the study, it has been observed that the Asymmetry Index obtained is lower in those specimens that have a high score in their hunting valuation, so it is considered that this factor can be taken into account as an objective and quantifiable indicator (biomarker).
A new method for the automated design of cooling systems in injection molds
(Elsevier, 2018-06-19) Mercado-Colmenero, Jorge Manuel; Rubio-Paramio, Miguel Ángel; Márquez-Sevillano, Juan de Juanes; Martín-Doñate, Cristina
This paper presents a new method for the automatic design of the cooling system in injection molds, based on the discrete geometry of the plastic part. In a first phase the new algorithm recognizes the discrete topology of the part, obtaining its depth map and detecting flat, concave regions and slender details which are difficult to cool. The algorithm performs an automatic analysis of the heat transfer, taking into account functional parameters, in order to guarantee a uniform cooling of the part. Based firstly on the limit range distance from which the horizontal straight channels lose cooling effectiveness and secondly on the depth map data, the algorithm provides an optimal layout for the cooling system of the part by adapting it to its geometry. By means of adapting the precision of the algorithm to the molded geometry, both horizontal straight channels for low concavity areas and baffle matrixes for concave regions are used. In a second phase, the parameters of the cooling system such as channel diameter, channel separation etc, are dimensioned by means of genetic optimization algorithms. A second genetic optimization algorithm ensures uniformity and balance in the layout of the cooling system for the plastic part. The result is the design of the cooling system for the plastic part with the same performance as the conformal system. A constant distance between the cooling channels and the part surface is maintained, and at the same time the manufacturing of the mold using CNC techniques and traditional metal materials could be achieved. Complementarily, the algorithm performs an interference analysis with other parts of the mold such as the ejection system. The method does not need a subsequent CAE analysis since it takes into account functional and technical parameters related to heat transfer in its design, thus ensuring its functionality. The algorithm is independent of the CAD modeler used to create the part since it performs a recognition analysis of the part surfaces, being able to be implemented in any CAD system. The data obtained in the design can be used additionally in later applications including the automated design of the injection mold.
A new methodology, based on a CAD system, for evaluating partial and global asymmetries in deer antlers from hunting quality assessment data
(MDPI, 2024-06-22) Montalvo-Gil, Juan Manuel; Azorit, Concepción; García-Molina, Diego Francisco; Valderrama-Zafra, José Manuel; Rubio-Paramio, Miguel Ángel
In the field of biology, the "biomarkers" of the different animal species are of great relevance, as well as the relationships between them and with the quality of the habitat. A study has been proposed, analysing the antlers of the Iberian deer, to measure the bilateral asymmetry of its branches. The antlers are characterised in a CAD 3D-model of their axial structure obtained by photogrammetric restitution from two photographs. This method quantifies the global and par-tial asymmetries of the antler's structural features. The research evaluated 48 deer antlers from hunting days and taxidermy workshops. To quantify asymmetries, the measurements required are the same as those considered to assess the hunting quality of antlers. Bilateral deviations are estimated for each structural trait and for the whole antler. Preliminary results showed a con-vergence between the values of global asymmetry and hunting quality. The methodology proved to be fast, inexpensive and easy to implement, which facilitates its use in future asym-metry studies of other biological elements of animal or plant origin. It is only necessary that the starting data, the bilateral axial structure of the analysed element, is characterised in a 3D-model.
A numerical and experimental study of a new Savonius wind rotor adaptation based on product design requirements
(Elsevier, 2018-01-09) Mercado-Colmenero, Jorge Manuel; Rubio-Paramio, Miguel Ángel; Guerrero-Villar, Francisca; Martín-Doñate, Cristina
This paper presents the numerical-experimental study carried out on a new rotor adapted from a Savonius rotor. Aesthetic, ergonomic and functional requirements have been incorporated into it in order to be part of sustainable consumer products. The new rotor consists of a parametric model adaptable to the dimensions and geometry of the products which it will be part of. A set of translation, symmetry, rotation and scaling operations have been applied to the bucket sections of the Savonius rotor by means of transforming the initial cylindrical buckets into topological surfaces with an organic shape. The new modified Savonius rotor and the conventional Savonius with the same Aspect Ratio have been tested in an open jet wind tunnel in order to verify the influence level of product design parameters on rotor performance, in terms of power coefficient, torque coefficient and mechanical power generated. Experimental tests have been carried out for Reynolds values in the range of [3,430·104 and 1,419·105]. A numerical analysis using an incompressible unsteady Reynolds average Navier Stockes model has been validated by means of the experimental results. Experimental and numerical results coincide with a 3.5% error. The behavior of the turbine has been analyzed by varying the angle of rotation for the sections of its buckets. Using a rotation angle of 45 ° the power coefficient values improve by 32% compared to the values obtained using an angle of 0 °. The rotor has been dimensioned for its application in a patented consumer product of small dimensions and requirements of lateral accessibility to its interior. Under these limited conditions the rotor meets the small-scale energy requirements of the product. The new rotor is designed as an aid to the energy consumption of the product in which it is incorporated, maintaining the advantages of a conventional Savonius rotor as self-starting, easy manufacture and maintenance, obtaining at the same time a product that sells better, is more able to integrate into its environment and is customizable for the consumer.
A numerical and experimental study of the compression uniaxial properties of PLA manufactured with FDM technology based on product specifications
(Springer, 2019-04-13) Mercado-Colmenero, Jorge Manuel; Rubio-Paramio, Miguel Ángel; La Rubia-García, María Dolores; Lozano-Arjona, David; Martín-Doñate, Cristina
This paper presents a numerical and experimental study of the compression uniaxial properties of PLA material manufactured with FDM based on product specifications. A first experimental test in accordance with the requirements and conditions established in the ISO 604 standard characterizes the mechanical and elastic properties of PLA manufactured with FDM technology and product requirements in a uniaxial compression stress field by testing six specimens. A second experimental test allows analyzing the structural behavior of the industrial case, evaluating the compression stiffness, the compression yield stress, the field of displacements and stress along its elastic area until reaching the compression yield stress and the ultimate yield stress data. To improve the structural analysis of the case study, a numerical validation was carried out using two analytical models. The first analytical model applies an interpolation procedure to the experimental results of the tested specimens in order to characterize the uniaxial tension-compression curve versus the nominal deformations by means of an 8-degree polynomial function. The second model defines the plastic material as elastic and isotropic with Young's compression modulus constant and according to the guidelines established in ISO standard 604. The comparison between experimental tests and numerical simulation results for the study case verify that the new model that uses the proposed polynomial function is closer to the experimental solution with only an 0.36% error, in comparison with the model with Young's compression modulus constant that reaches an error of 4.27%. The results of the structural analysis of the mechanical element indicate that the elastic region of the plastic material PLA manufactured with FDM can be modeled numerically as an isotropic material, using the elastic properties from the experimental results of the specimens tested according to ISO standard 604. In this way it is possible to characterize the PLA FDM material as isotropic, obtaining as an advantage its easy definition in the numerical simulation software as it does not require the modification of the constitutive equations in the material database. SEM micrographs have indicated that the fracture of the failed test specimens is of the brittle type, mainly caused by the separation between the central plastic filament layers of the specimens. The results presented suggest that the use of FDM technology with PLA material is promising for the manufacture of low volume industrial components that are subject to compression efforts or for the manufacture of components by the user.
A numerical and experimental study of the compression uniaxial properties of PLA manufactured with FDM technology based on product specifications
(Int J Adv Manuf Technol. 103, pages1893–1909 (2019), 2019-04-13) Mercado-Colmenero, Jorge Manuel; Rubio-Paramio, Miguel Ángel; La Rubia-García, M.Dolores; Lozano-Arjona, David; Martin-Doñate, Cristina
This paper presents a numerical and experimental study of the compression uniaxial properties of PLA material manufactured with FDM based on product specifications. A first experimental test in accordance with the requirements and conditions established in the ISO 604 standard characterizes the mechanical and elastic properties of PLA manufactured with FDM technology and product requirements in a uniaxial compression stress field by testing six specimens. A second experimental test allows analyzing the structural behavior of the industrial case, evaluating the compression stiffness, the compression yield stress, the field of displacements, and stress along its elastic area until reaching the compression yield stress and the ultimate yield stress data. To improve the structural analysis of the case study, a numerical validation was carried out using two analytical models. The first analytical model applies an interpolation procedure to the experimental results of the tested specimens in order to characterize the uniaxial tension-compression curve versus the nominal deformations by means of an 8-degree polynomial function. The second model defines the plastic material as elastic and isotropic with Young’s compression modulus constant and according to the guidelines established in ISO standard 604. The comparison between experimental tests and numerical simulation results for the study case verify that the new model that uses the proposed polynomial function is closer to the experimental solution with only an 0.36% error, in comparison with the model with Young’s compression modulus constant that reaches an error of 4.27%. The results of the structural analysis of the mechanical element indicate that the elastic region of the plastic material PLA manufactured with FDM can be modeled numerically as an isotropic material, using the elastic properties from the experimental results of the specimens tested according to ISO standard 604. In this way, it is possible to characterize the PLA FDM material as isotropic, obtaining as an advantage its easy definition in the numerical simulation software as it does not require the modification of the constitutive equations in the material database. SEM micrographs have indicated that the fracture of the failed test specimens is of the brittle type, mainly caused by the separation between the central plastic filament layers of the specimens. The results presented suggest that the use of FDM technology with PLA material is promising for the manufacture of low volume industrial components that are subject to compression efforts or for the manufacture of components by the user.
An interactive photogrammetric method for assessing deer antler quality using a parametric Computer-Aided Design system (Interactive Photogrammetric Measure Method)
(ELSEVIER, 2016-07-19) Rubio-Paramio, Miguel Ángel; Montalvo-Gil, Juan Manuel; Ramírez-Garrido, José Alberto; Martínez-Salmerón, Débora; Azorit, Concepción
In the area of deer antler evaluation for trophy homologation, as well as in the obtaining of biometric databases for later analysis in the field of Geometric Morphometrics, different linear biometric tools have traditionally been used. In this study we used two sets of antlers from 29 Iberian red deer (Cervus elaphus hispanicus) to develop and establish a new photogrammetric technique which creates the 3D model of the antler using a parametric 3D Computer-Aided Design (CAD). This simple and reliable method for deer hunting trophy homologation was compared with the other two more extensively used methods of antler measurement, the traditional measuring tape and the Articulated Arm Coordinate Measuring Machine (AACMM or CMA). The advantage of this innovative photogrammetric method is the use of only two photographs to obtain both the 3D model and the dimensions required for antler evaluation. A procedure was performed to compare lengths and antler evaluation as hunting trophy. The three methods showed similar reliability, although the photogrammetric process using the 3D CAD system was much faster and more functional than both the traditional measuring tape and Articulated Arm methods. Since this method only requires two photographs per individual, it makes possible the study of a high percentage of antlers in the field. This new photogrammetric method has been successfully used in the biometrics area, but it could become a more extensively used method in this and other fields because of its ease of operation, speed and accuracy of data collection.
Comprehensive design of the 3D printing process for architectural models. A case study: the medieval walled enclosure of Priego De Cordoba (E1:200)
(Springer, 2024-03-26) García-Molina, Diego Francisco; Carmona-Ávila, Rafael; Montalvo-Gil, Juan Manuel; Rubio-Paramio, Miguel Ángel
Nowadays, an object can be viewed both physically and virtually. In both cases, the visualization process consists in a continuous variation of the observer’s perspective. When looking at objects, visual interactivity is achieved by the tandem formed by human vision and the position of the observer. 3D technology allows the viewer to delve into this aspect: starting from a virtual reconstruction. It is possible to go from the virtual 3D reconstruction of a model shown on a display to a real element materialized by means of a scale model or prototype. The innovation of this research lies in the development of an efficient method for printing 3D models, with a specific emphasis on material and time savings. This study aims to obtain the three-dimensional physical model of the walled enclosure of the city of Priego de Córdoba in the Middle Ages, at its time of greatest historical development, i.e., in the late 15th century. To this end, 3D printing technology was applied, which is an innovative method for the realization of architectural scale models. The performance of 3D printers, with different printing formats, was evaluated in terms of efficiency and quality of the architectural scale models. Our theoretical assumption showed that material saving is determined by the orography slopes of the model. Obtaining slopes with values in the range of 1–5%, a large format printer is the most suitable option; in the range of 5–15%, the medium format printer is recommended; and, for a slope greater than 15%, the small format printer should be used.
Comprehensive design of the 3D printing process for architectural models. A case study: the medieval walled enclosure of Priego De Cordoba (E1:200)
(SPRINGER NATURE, 2024-03-26) García-Molina, Diego Francisco; Carmona-Ávila, Rafael; Montalvo-Gil, Juan Manuel; Rubio-Paramio, Miguel Ángel
Nowadays, an object can be viewed both physically and virtually. In both cases, the visualization process consists in a continuous variation of the observer’s perspective. When looking at objects, visual interactivity is achieved by the tandem formed by human vision and the position of the observer. 3D technology allows the viewer to delve into this aspect: starting from a virtual reconstruction. It is possible to go from the virtual 3D reconstruction of a model shown on a display to a real element materialized by means of a scale model or prototype. The innovation of this research lies in the development of an efficient method for printing 3D models, with a specific emphasis on material and time savings. This study aims to obtain the three-dimensional physical model of the walled enclosure of the city of Priego de Córdoba in the Middle Ages, at its time of greatest historical development, i.e., in the late 15th century. To this end, 3D printing technology was applied, which is an innovative method for the realization of architectural scale models. The performance of 3D printers, with different printing formats, was evaluated in terms of efficiency and quality of the architectural scale models. Our theoretical assumption showed that material saving is determined by the orography slopes of the model. Obtaining slopes with values in the range of 1–5%, a large format printer is the most suitable option; in the range of 5–15%, the medium format printer is recommended; and, for a slope greater than 15%, the small format printer should be used.
Impact of topographic factors on animal field pathings: Analysis and prediction of deer movement patterns
(ELSEVIER, 2024-01-19) Valderrama-Zafra, José Manuel; Rubio-Paramio, Miguel Ángel; García-Molina, Diego Francisco; Mercado-Colmenero, Jorge Manuel; Oya, Antonia; Carrasco, Rafael; Azorit, Concepción
Understanding and tracking the complexities of animal movement patterns is of paramount importance in wildlife management, conservation efforts, and the sustainable use of natural resources. An infinite number of factors influence the movement path of animals within their respective habitats, including: the structure of the habitat, the availability of resources, the presence of natural predators, social memory, the topographic attributes of the environment, etc. Numerous studies have attempted to delineate the spatial boundaries of animal habitats by elucidating the complexities of their movement dynamics. These investigations have highlighted the profound impact of factors such as environmental topography and the presence of natural impediments and other anthropogenic structures on animal mobility, but very few have analyzed topographic factors at a fine three-dimensional spatial scale. This research focuses on a novel methodology for identifying animal trajectories at a fine scale and evaluating the influence of topographic factors on these trajectories, specifically of deer herds in southern Spain. To understand movement patterns, transects recorded in the field due to continued use by deer are analyzed. Topographical information was obtained in two steps: first with a graphical analysis of orthophotos for the incorporation of the sufficient data set. Secondly, the veracity of this data was verified using Global Positioning System (GPS) tracking technology. The integration of data from multiple sources with Geographic Information Systems (GIS) allowed the analysis to be automated. Next a statistical linear regression model, based on both the ascent and descent lengths and the total length of the path traveled, was designed to infer the trajectories between two designated points within the study area. Using topographical variables obtained in the study environment, such as the slope, the elevation difference (cumulative vertical distance), and the 3D length of the transect paths, the influence of these variables on the movement decisions of animals within their habitat is established in order to facilitate their subsequent prediction. Analytical tests of the trajectories have shown that the movement behavior of cervids is predictable. The results demonstrate the usefulness of the methodology presented which, by providing and collect valuable topographic information on movement and transit areas, can guide sustainable management practices for deer populations and their habitats.
Metodología Fotogramétrica integrada en un sistema CAD paramétrico y aplicaciones en el ámbito de la Biología Animal
(2024-09-27) Montalvo-Gil, Juan Manuel; Azorit, Concepción; Rubio-Paramio, Miguel Ángel; Universidad de Jaén. Departamento de Biología Animal, Biología Vegetal y Ecología
La investigación se basa en la propuesta de metodologías y procedimientos que permitan realizar análisis biológicos, en formato digital, destinados a cuantificar variables y biomarcadores en la cuerna de cérvidos, ciervos y gamos. A partir de dichos resultados se podrán realizar otros estudios posteriores en base a determinar las causas y factores de influencia. Las cuernas analizadas proceden de jornadas de caza y de trofeos de talleres de taxidermia. Éstas se caracterizan en forma de modelo-3D de tipo ‘axial’ aplicando una técnica de restitución fotogramétrica. La cuerna del gamo se representa en forma de modelo-3D ‘sólido’ aplicando varias tecnologías. Se realiza un estudio para determinar la precisión de los modelos-3D obtenidos. Posteriormente se implementan las caracterizaciones digitales de la cuerna en aplicaciones biológicas en base a, cuantificar el grado de calidad cinegética, de asimetrías, global y parciales para los rasgos estructurales de la cuerna, y de volumen. The research is based on the proposal of methodologies and procedures to carry out biological analyses, in digital format, aimed at quantifying variables and biomarkers in the antlers of cervids, deer and fallow deer. Based on these results, further studies can be carried out to determine the causes and influencing factors. The antlers analysed come from hunting days and trophies from taxidermy workshops. They are characterised in the form of an 'axial' 3D-model using a photogrammetric restitution technique. The antler of the fallow deer is represented as a 'solid' 3D-model using various technologies. A study is carried out to determine the accuracy of the 3D models obtained. Subsequently, digital characterisations of the antler are implemented in biological applications based on the quantification of the degree of hunting quality, asymmetries, global and partial asymmetries for the structural traits of the antler, and volume.
Optimization of Modeling and 3D Printing of Architectural Elements in Historical Buildings Through the Systematization of Boolean Solid Operations
(SPRINGER NATURE, 2023-02-14) García-Molina, Diego Francisco; Valderrama-Zafra, José Manuel; Montalvo-Gil, Juan Manuel; Rubio-Paramio, Miguel Ángel
En ciertas ocasiones se encuentran modelos 3D que solo por visualizarse en la pantalla de un ordenador se cree que se puede imprimir en 3D. Para que realmente pueda ser así, cuando se diseña una pieza, hay que tener en cuenta que nuestro modelo ha de ser sólido y ha de estar completamente cerrado. El presente trabajo de investigación consiste en el modelado 3D tanto del exterior como del interior de la Torre del Homenaje de Priego de Córdoba. Dada la complejidad que posee el interior del citado modelo 3D se propone diseñar el interior de la torre como si fuese un molde 3D virtual en positivo y tras aplicar operaciones booleanas restar el citado molde 3D virtual al exterior de la torre. El objetivo consiste en conseguir un modelo 3D imprimible y realizar un análisis variando los modos de impresión.
Tecnologías gráficas, de análisis del terreno y posicionamiento espacial aplicadas al estudio y la gestión de la fauna silvestre en ecosistemas mediterráneos
(Jaén : Universidad de Jaén, 2024-06-07) Valderrama-Zafra, José Manuel; Azorit, Concepción; Rubio-Paramio, Miguel Ángel; Oya, Antonia; Universidad de Jaén. Departamento de Biología animal, biología vegetal y ecología
La Tesis Doctoral se enfoca en estudiar la influencia de los factores topográficos en el comportamiento animal en ecosistemas mediterráneos del sur de España, validando métodos topográficos para monitorear la fauna. Destaca la importancia de considerar la tridimensionalidad del terreno en estudios ecológicos y biológicos, demostrando su impacto en la vida animal. Se analizan trayectorias de especies como el conejo, lince, lobo y ciervo, integrando factores topográficos en modelos de consumo energético y estimación de corredores ecológicos. Se desarrolla una metodología para la identificación de trayectorias animales y se prueba la tecnología GNSS para la monitorización de la vida silvestre. Actualmente, se investiga cómo el consumo energético influye en las rutas de desplazamiento animal, combinando técnicas desarrolladas en la tesis con formulaciones existentes sobre el consumo energético animal. The Doctoral Thesis focuses on studying the influence of topographic factors on animal behavior in Mediterranean ecosystems of southern Spain, validating topographic methods for monitoring wildlife. It highlights the importance of considering the three dimensionality of the terrain in ecological and biological studies, demonstrating its impact on animal life. Trajectories of species such as rabbit, lynx, wolf and deer are analyzed, integrating topographic factors in models of energy consumption and estimation of ecological corridors. A methodology for the identification of animal trajectories is developed and GNSS technology for wildlife monitoring is tested. Currently, we are investigating how energy consumption influences animal movement routes, combining techniques developed in the thesis with existing formulations on animal energy consumption.
Three 3D graphics engineering technologies for fallow deer antlers characterization in ecology and management approaches
(SPRINGER, 2024-12-03) Montalvo‑Gil, Juan Manuel; Azorit, Concepción; García-Molina, Diego Francisco; Valderrama-Zafra, José Manuel; Rubio-Paramio, Miguel Ángel
Numerous studies focus on creating 3D-models of biological elements for geometric evaluation using CAD tools. A crucial aspect is to obtain accurate geometrical data that is easy to obtain and cost-effective for analysis. The main objective is to evaluate the geometrical accuracy of 3D-models obtained with three graphical techniques of three-dimensional geometrical documentation that characterise the fallow deer antlers in an accurate 3D-model, which is used as input data in biological analyses estimating hunting quality, asymmetry and volume. Three technologies are evaluated: structured light scanning, multi-image photogrammetry (SfM), Structure from Motion, and spatial photogrammetric restitution using two photographs in a CAD system. The geometric accuracy of the 3D-models obtained and the deviation between relevant points of the antler structure, in the main beam, in the main tines and palm, are estimated. Subsequently, the suitability of each 3D-model is studied according to the type of biological application for which it is intended. Based on the results, solid and axial 3D-models, the applicability of the three techniques for the study of biological parameters such as hunting quality, asymmetry and volume is discussed. It concludes on the most appropriate procedure to define the digital characterisation of the antler, depending on the type of biological study to be carried out in order to obtain accurate results. Characterising a geometrically complex structure such as the fallow deer antler in a 3D-model quickly and accurately can help to quantify various biomarkers in populations of specimens, making it possible to infer internal and external influencing factors.
Three 3D graphics engineering technologies for fallow deer antlers characterization in ecology and management approaches
(SPRINGER NATURE, 2024-12-03) Montalvo-Gil, Juan Manuel; Azorit, Concepción; García-Molina, Diego Francisco; Valderrama-Zafra, José Manuel; Rubio-Paramio, Miguel Ángel
Numerous studies focus on creating 3D-models of biological elements for geometric evaluation using CAD tools. A crucial aspect is to obtain accurate geometrical data that is easy to obtain and cost-effective for analysis. The main objective is to evaluate the geometrical accuracy of 3D-models obtained with three graphical techniques of three-dimensional geometrical documentation that characterise the fallow deer antlers in an accurate 3D-model, which is used as input data in biological analyses estimating hunting quality, asymmetry and volume. Three technologies are evaluated: structured light scanning, multi-image photogrammetry (SfM), Structure from Motion, and spatial photogrammetric restitution using two photographs in a CAD system. The geometric accuracy of the 3D-models obtained and the deviation between relevant points of the antler structure, in the main beam, in the main tines and palm, are estimated. Subsequently, the suitability of each 3D-model is studied according to the type of biological application for which it is intended. Based on the results, solid and axial 3D-models, the applicability of the three techniques for the study of biological parameters such as hunting quality, asymmetry and volume is discussed. It concludes on the most appropriate procedure to define the digital characterisation of the antler, depending on the type of biological study to be carried out in order to obtain accurate results. Characterising a geometrically complex structure such as the fallow deer antler in a 3D-model quickly and accurately can help to quantify various biomarkers in populations of specimens, making it possible to infer internal and external influencing factors.

RUJA: Repositorio Institucional de Producción Científica

Examinando por Autor "Rubio-Paramio, Miguel Ángel"